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Part transfer offset on lathe work offset?

marcopolo10

Plastic
Joined
Oct 11, 2023
Hello! I'm looking for recommendations on how to do part transfers and work off the sub spindle on a HAAS St20y mill turn. Is it possible to do it all using One work offset G54? Or would I need G55 for the sub once the swap happens? Also tips on how to program the sub movements, do I leave at home and make all it's movements -values or do I home it where it'll clamp on the part any tips on this would be appropriate!!
 
Apparently this is sub day. How I do it:

*Set your main oriented tools off the face of the main chuck.

*Set your sub oriented tools off the face of the sub chuck in its home position.

*Set radial tools off whichever chuck they will be used with.

*Use a G10L2P1 Zx.xx A-x.xx to set G54 to the face of the stock. So if you have 1" stick out you'll have Z1. Then when you go to pick off it's very simple.

*Use another G10 line to set G55 for how far the part sticks out of the sub. This will be negative, Z-x.xxx. Sometimes short tools won't reach when the sub is home, so I'll send it to -1 or -2 and then add that to the offset.


Caveat: I'm not nearly as knowledgeable as some guys on here, it's entirely possible there's smarter ways to do this.
 
I have all of my tools essentially zero'd to my main collet (chuck?) face.

I use G10 P0 X0 Z-1. to set Part Shift (or whatever it is called).
I doo this in the header of every program, and I never have to call a fixture offset anywhere else in the program, and it is always there when I run the job again.

The Z-1. in the above example sets your part 1" from the chuck surface.
Always negative on a Fanuc, IDK about a Haas.

I park my sub at a place that sets my bnack face of my part to a whole number. (Z13" example)
From there I just write my code as if Z13. was zero.

G0 X0 Z12.9
G1 Z13.25
G0 Z12.9
T0 X15.

I will agree that most of your turning tools will work one side only, but there are times when you will want one for a longer shaft. But live tools - well those can go anywhere!

I just feel more in control when I know that everything is on the same page.
There's no right or wrong, just what you git comfortable with is all.


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